What are george polya's four basic principles of problem solving?

What is a line down the middle? Is 6.405 then 6.45? What is the LCM for 54 and 54? Who was the first person try scissors? From what does pi derive from? When air pushed out of the logs in through the Larynx The blank and blank work alongside the palates The bony ridge and the teeth to produce the sound? What is 1.6 percent of a trillion dollars? How many 18 inch square tiles are needed to cover 280 sq ft area? Does a circle have a set of parallel lines? How do you spell 230? What is 98.6 degrees Fahrenheit in centigrade? Do all the internal angles in a triangle add up to 180 degree? What are the ordered pairs for 20? What is the circumference of a circle with a diameter of 13 inches? How do you explain how to round to the nearest tenth? What is four time six? What is the full form of xyz analysis? What does a 11x12mm circle look like? What number is divided by blank that equals 110? What is the gcf of 36 and 132?